Develop Reference

Azure Function HttpClient doesn't give any response and keeps retrying

I have a Function App running in Azure. It is a HttpTrigger, and it is triggered by a Stream Analytics, with a Retry Policy set to Drop. It is coded in C#, and deployed from DevOps through CI/CD. Here are some of the configs.
FUNCTIONS_EXTENSION_VERSION: ~4
FUNCTIONS_WORKER_RUNTIME: dotnet-isolated
WEBSITE_RUN_FROM_PACKAGE: 1
The purpose of the function is to get some data and forward it using a HttpClient (created through a HttpClientFactory, and with a timeout of 15 sec) to various other endpoints on different servers. Everything have worked so far, until recently where a new endpoint on a new server was added. The problem is somehow related to this new server, but I am having a hard time getting any useful logs from my end, and also the whole Function is acting weird when sending data. Here is the end of the code:
log.LogInformation($"Preparing to send...");
var content = new StringContent(jsonContent, Encoding.UTF8, "application/json");
var httpRequestMessage = new HttpRequestMessage
{
Method = HttpMethod.Post,
RequestUri = new Uri(uri),
Headers = {
{ "Authorization", $"Bearer {token}" },
{ "Accept", "*/*" },
},
Content = content
};
var response = await _httpClient.SendAsync(httpRequestMessage);
var responseString = await response.Content.ReadAsStringAsync();
log.LogInformation($"Returned content: {responseString}.");
I use Application Insights to monitor. The uri parameter is different based on where to send the data, and it is working for everywhere except 1 endpoint. When I try to send to this "faulty" endpoint, this is what I see in Application Insights:
01:27:37 PM Trace: Preparing to send...
01:27:37 PM Trace: Start processing HTTP request POST https://... (URI parameter)
01:27:37 PM Trace: Sending HTTP request POST https://... (URI Parameter)
01:27:37 PM Trace: End processing HTTP request after 188.05ms - OK
01:27:37 PM Trace: Received HTTP response after 187.92ms - OK
01:29:17 PM Exception: Exception while executing function: Functions.MyFunction
01:29:17 PM Trace:Executed 'Functions.MyFunction' (Failed, Id=3d9afe5b-c58a-470d-8f54-0d98ca60deb7, Duration=100005ms
01:29:17 PM Exception: Exception while executing function: Functions.MyFunction
When I inspect the exception, it says:
Exception while executing function: Functions.MyFunction Result: Failure
Exception: System.AggregateException: One or more errors occurred. (A task was canceled.)
---> System.Threading.Tasks.TaskCanceledException: A task was canceled.
at System.Threading.Tasks.Task.GetExceptions(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at Microsoft.Azure.Functions.Worker.Invocation.DefaultFunctionInvoker`2.<>c.<InvokeAsync>b__6_0(Task`1 t) in D:\a\1\s\src\DotNetWorker.Core\Invocation\DefaultFunctionInvoker.cs:line 32
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
at System.Threading.Tasks.Task.<>c.<.cctor>b__272_0(Object obj)
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
at System.Threading.Tasks.Task.ExecuteFromThreadPool(Thread threadPoolThread)
at System.Threading.ThreadPoolWorkQueue.Dispatch()
at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()
at System.Threading.Thread.StartCallback()
--- End of stack trace from previous location ---
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at Microsoft.Azure.Functions.Worker.Invocation.DefaultFunctionInvoker`2.<>c.<InvokeAsync>b__6_0(Task`1 t) in D:\a\1\s\src\DotNetWorker.Core\Invocation\DefaultFunctionInvoker.cs:line 32
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
at System.Threading.Tasks.Task.<>c.<.cctor>b__272_0(Object obj)
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
--- End of stack trace from previous location ---
at Microsoft.Azure.Functions.Worker.Invocation.DefaultFunctionExecutor.ExecuteAsync(FunctionContext context) in D:\a\1\s\src\DotNetWorker.Core\Invocation\DefaultFunctionExecutor.cs:line 45
at Microsoft.Azure.Functions.Worker.OutputBindings.OutputBindingsMiddleware.Invoke(FunctionContext context, FunctionExecutionDelegate next) in D:\a\1\s\src\DotNetWorker.Core\OutputBindings\OutputBindingsMiddleware.cs:line 16
at Microsoft.Azure.Functions.Worker.GrpcWorker.InvocationRequestHandlerAsync(InvocationRequest request, IFunctionsApplication application, IInvocationFeaturesFactory invocationFeaturesFactory, ObjectSerializer serializer, IOutputBindingsInfoProvider outputBindingsInfoProvider) in D:\a\1\s\src\DotNetWorker.Grpc\GrpcWorker.cs:line 167
Stack: at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at Microsoft.Azure.Functions.Worker.Invocation.DefaultFunctionInvoker`2.<>c.<InvokeAsync>b__6_0(Task`1 t) in D:\a\1\s\src\DotNetWorker.Core\Invocation\DefaultFunctionInvoker.cs:line 32
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
at System.Threading.Tasks.Task.<>c.<.cctor>b__272_0(Object obj)
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
--- End of stack trace from previous location ---
at Microsoft.Azure.Functions.Worker.Invocation.DefaultFunctionExecutor.ExecuteAsync(FunctionContext context) in D:\a\1\s\src\DotNetWorker.Core\Invocation\DefaultFunctionExecutor.cs:line 45
at Microsoft.Azure.Functions.Worker.OutputBindings.OutputBindingsMiddleware.Invoke(FunctionContext context, FunctionExecutionDelegate next) in D:\a\1\s\src\DotNetWorker.Core\OutputBindings\OutputBindingsMiddleware.cs:line 16
at Microsoft.Azure.Functions.Worker.GrpcWorker.InvocationRequestHandlerAsync(InvocationRequest request, IFunctionsApplication application, IInvocationFeaturesFactory invocationFeaturesFactory, ObjectSerializer serializer, IOutputBindingsInfoProvider outputBindingsInfoProvider) in D:\a\1\s\src\DotNetWorker.Grpc\GrpcWorker.cs:line 167
And then it seems the function retries the Http request, which I don't understand why. The "Preparing to send" log is not present, but the "Start processing" logs appears and fails every ~2 minutes. Since my custom log message is not here, I take it that it is the HttpClient that is retrying somehow and not the entire Function.
Does anyone have a clue what is going on? Why does my code seem to get stuck trying to read the response.Content? How can I further investigate what is going wrong, and why is the HttpClient retrying itself like this? I would expect the Function to crash/stop if the HttpClient fails.
EDIT: Corrected timestamps on log to match duration. There are multiple logs appearing at the same time, and I picked wrong ones.

Hard to help as we don't have access to your environment, but here's what I would try:
It seems to me that the issue with the log is because it's an async operation, this log doesn't represent the inner/real exception. I recommend you switch to a sync operation and send to this faulty endpoint. Once you get the real exception / proper fix, you switch back to async operation.

With tip from Thiago of changing from async, I have received a proper exception, which helped me put the pieces together.
The new error:
The request was canceled due to the configured HttpClient.Timeout of 100 seconds elapsing.
I am using 2 different HttpClients, one for my error and another for a timed Token updater. It seems my first issue was me adding the 15 sec Timeout to the wrong client (doh). With this new info, the duration of 100005ms makes much more sense.
Next, the timeout exception from the HttpClient were not caught, and caused the whole function to crash producing the "A task was cancelled" error.
Finally, the reason it keeps restarting seems to be caused by Azure Stream Analytics after all. On a closer look at the error policy docs, it seems despite being set to "Drop", it will still retry in some cases based on the error.
I still have a problem as to why my request times out, but my original question as to what was going on is answered :)

HttpClient.GetAsync() gives an AggregateException while fetching data on Azure Function

I am trying to fetch Employee data from Zoho using the URL :
https://people.zoho.com/people/api/forms/P_EmployeeView/records
using the HttpClient's GetAsync(). While executing the code in my local dev environment the code runs smoothly and fetches the required data but as soon as I publish my code to the azure function I get an exception with the following stack trace :
2021-06-01T06:14:45.870 [Error] System.AggregateException: One or more errors occurred. (One or
more errors occurred. (A connection attempt failed because the connected party did not properly
respond after a period of time, or established connection failed because connected host has failed
to respond.))---> System.AggregateException: One or more errors occurred. (A connection attempt
failed because the connected party did not properly respond after a period of time, or established
connection failed because connected host has failed to respond.)--->
System.Net.Http.HttpRequestException: A connection attempt failed because the connected party did
not properly respond after a period of time, or established connection failed because connected
host has failed to respond.---> System.Net.Sockets.SocketException (10060): A connection attempt
failed because the connected party did not properly respond after a period of time, or established
connection failed because connected host has failed to respond.at
System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken
cancellationToken)--- End of inner exception stack trace ---at
System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken
cancellationToken)at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request,
Boolean allowHttp2, CancellationToken cancellationToken)at
System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request,
CancellationToken cancellationToken)at
System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request,
CancellationToken cancellationToken)at
System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean
doRequestAuth, CancellationToken cancellationToken)at
System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken
cancellationToken)at System.Net.Http.DiagnosticsHandler.SendAsync(HttpRequestMessage request,
CancellationToken cancellationToken)at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1
sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)--- End of
inner exception stack trace ---at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean
includeTaskCanceledExceptions)at System.Threading.Tasks.Task`1.GetResultCore(Boolean
waitCompletionNotification)at System.Threading.Tasks.Task`1.get_Result()at
EmployeeDataRefresh.ZohoClient.GetEmployeeData(ILogger log) in
C:\Projects\ZohoAttendance\Internal-Automation-and-Power-BI-Dashboard-zoho-employee-data-
update\src\EmployeeDataRefresh\EmployeeDataRefresh\ZohoClient.cs:line 39--- End of inner exception
stack trace ---at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean
includeTaskCanceledExceptions)at System.Threading.Tasks.Task`1.GetResultCore(Boolean
waitCompletionNotification)at System.Threading.Tasks.Task`1.get_Result()at
EmployeeDataRefresh.Trigger.DoRefresh(ILogger log) in C:\Projects\ZohoAttendance\Internal-
Automation-and-Power-BI-Dashboard-zoho-employee-data-
update\src\EmployeeDataRefresh\EmployeeDataRefresh\Trigger.cs:line 68at
EmployeeDataRefresh.Trigger.AutoRefreshEmployeeData(TimerInfo myTimer, ILogger log) in
C:\Projects\ZohoAttendance\Internal-Automation-and-Power-BI-Dashboard-zoho-employee-data-
update\src\EmployeeDataRefresh\EmployeeDataRefresh\Trigger.cs:line 30
Here's my code that fetches the data
using(var httpClient = new HttpClient())
{
httpClient.DefaultRequestHeaders.Authorization
= new AuthenticationHeaderValue("Bearer", _authToken);
Uri myUri = new Uri(_url, UriKind.Absolute);
var response = httpClient.GetAsync(myUri);
log.LogInformation(_authToken);
log.LogInformation("Sending Get Request to Zoho...\n");
var data = await response.Result.Content.ReadAsStringAsync();
log.LogInformation("Data fetched from Zoho...\n");
var employes = JsonConvert.DeserializeObject<List<Employee>>(data);
return employes;
}
I get the error at line
var data = await response.Result.Content.ReadAsStringAsync();
I have put various log statements to debug the issue and the last log statement that gets printed on azure function log is "Sending Get Request to Zoho...".
I have printed the tokens and other required variables to check whether they have correct values and they are getting the correct value so invalid token is definitely not an issue. Can someone suggest what could be the possible reason for this error ?

are you expecting json response type ? and for best practice perhaps you need to supply in your header of httpclient
string contentTypeValue = "application/json";
client.DefaultRequestHeaders.Add("Content-Type", contentTypeValue);
and also practice
httpResponse.EnsureSuccessStatusCode(); // throws if not 200-299
before read result stream.

Here there is no issue with token or any authentication , just clear out asynchronous programming,
Frist,
Instead, by getting the value of the response.Result property, you force the current thread to wait until the asynchronous operation has completed, and second I will recommend
static readonly HttpClient client = new HttpClient();
try
{
httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", _authToken);
Uri myUri = new Uri(_url, UriKind.Absolute);
HttpResponseMessage response = await client.GetAsync(_url);
var data = await response.Result.Content.ReadAsStringAsync();
var employes = JsonConvert.DeserializeObject<List<Employee>>(data);
}
catch (Exception)
{
throw;
}

HttpClient File Download Error - Unable to read data from the transport connection

I've written an application that in part can download files from a specific web service. The code utilizes an HttpClient to make the calls. The problem is that occasionally I will get a failed request with the following exception message:
Unable to read data from the transport connection: The connection was closed.
I did run across these blog posts, in which the author had to revert the protocol version to 1.0, disable keep alive, and limit the number of service point connections:
http://briancaos.wordpress.com/2012/07/06/unable-to-read-data-from-the-transport-connection-the-connection-was-closed/
http://briancaos.wordpress.com/2012/06/15/an-existing-connection-was-forcibly-closed-by-the-remote-host/
I followed those instructions, as best I knew how and still got the error. I also made sure to keep a single instance of the HttpClient around (following the Singleton principle).
What is interesting is that when running Fiddler I've yet to get the error, which makes me think that there is something that can be done on the client side since Fiddler appears to be doing something to keep the connection alive (though the issue is so sporadic this may be a red herring).
A couple more notes:
The error invariably occurs in the middle of a download (never when initiating the request).
The file continues to download up to the point of failure (there are no extended pauses or delays first).
--UPDATE--
The error occurs on the following line:
responseTask.Wait(cancellationTokenSource.Token);
The following is the full exception:
System.AggregateException occurred HResult=-2146233088 Message=One
or more errors occurred. Source=mscorlib StackTrace:
at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
at Form1.StartDownload() in c:\Projects\Visual Studio 2012\Demo\Demo\Form1.cs:line 88 InnerException:
System.Net.Http.HttpRequestException
HResult=-2146233088
Message=Error while copying content to a stream.
InnerException: System.IO.IOException
HResult=-2146232800
Message=Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.
Source=System
StackTrace:
at System.Net.ConnectStream.EndRead(IAsyncResult asyncResult)
at System.Net.Http.HttpClientHandler.WebExceptionWrapperStream.EndRead(IAsyncResult
asyncResult)
at System.Net.Http.Handlers.ProgressStream.EndRead(IAsyncResult
asyncResult)
at System.Net.Http.StreamToStreamCopy.BufferReadCallback(IAsyncResult ar)
InnerException: System.Net.Sockets.SocketException
HResult=-2147467259
Message=An existing connection was forcibly closed by the remote host
Source=System
ErrorCode=10054
NativeErrorCode=10054
StackTrace:
at System.Net.Sockets.NetworkStream.EndRead(IAsyncResult asyncResult)
InnerException:
--UPDATE #2--
I thought I would try changing the completion option from 'content read' to 'headers read'. This also failed with the same exception, albeit in a different location (where the TODO comment is, reading the content stream).
--UPDATE #3--
I can confirm that the web service (which is hosted in IIS) is aborting the connections (the IIS logs show a win32 status code of 1236 - ERROR_CONNECTION_ABORTED). To try and narrow things down, the MinFileBytesPerSec metabase property was set to zero (on the off chance the client stopped pulling down data momentarily) and the connection is still being aborted. I've double checked all the timeouts and buffer sizes I can think of to no avail. Clawing at thin air at the moment. Any ideas would be appreciated.
Client Setup:
private void SetupClient()
{
// In case we're taxing the web server, limit the number
// connections we're allowed to make to one.
ServicePointManager.DefaultConnectionLimit = 1;
// Set up the progress handler so that we can keep track of the download progress.
_progressHandler = new ProgressMessageHandler();
_progressHandler.HttpReceiveProgress += ProgressHandler_HttpReceiveProgress;
// Create our HttpClient.
_client = HttpClientFactory.Create(_progressHandler);
_client.BaseAddress = new Uri("http://localhost");
_client.Timeout = TimeSpan.FromMinutes(30);
_client.DefaultRequestHeaders.TransferEncodingChunked = true;
}
Download Logic:
private void StartDownload()
{
// Create the request.
using (HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "http://localhost/Download"))
{
// Revert the protocol version and turn off keep alive in accordance with:
// http://briancaos.wordpress.com/2012/07/06/unable-to-read-data-from-the-transport-connection-the-connection-was-closed/
// http://briancaos.wordpress.com/2012/06/15/an-existing-connection-was-forcibly-closed-by-the-remote-host/
request.Version = new Version("1.0");
request.Headers.Add("Keep-Alive", "false");
// Set the cancellation token's timeout to 30 minutes.
int timeoutInMilliseconds = 30 * 60 * 1000;
using (CancellationTokenSource cancellationTokenSource = new CancellationTokenSource(timeoutInMilliseconds))
{
// Making sure that the message isn't "complete" until everything is read in so we can cancel it at anytime.
Task<HttpResponseMessage> responseTask = _client.SendAsync(request, HttpCompletionOption.ResponseContentRead);
responseTask.Wait(cancellationTokenSource.Token);
using (HttpResponseMessage response = responseTask.Result)
{
if (!response.IsSuccessStatusCode)
{
throw new Exception("Request failed!");
}
Task<Stream> streamTask = response.Content.ReadAsStreamAsync();
using (Stream contentStream = streamTask.Result)
{
// TODO: Save to disk.
}
}
}
}
}

C# Neo4jClient TaskCancelled Exception

I am making a pretty long query to Neo4j database using Neo4jClient and getting an exception which occurs pretty randomly. How to fix this?
System.AggregateException: One or more errors occurred. ---> System.AggregateException: One or more errors occurred. ---> System.Threading.Tasks.TaskCanceledException: A task was canceled.
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at Neo4jClient.GraphClient.<>c__DisplayClass3.<SendHttpRequestAsync>b__2(Task`1 requestTask) in c:\TeamCity\buildAgent\work\f1c4cf3efbf1b05e\Neo4jClient\GraphClient.cs:line 149
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at Neo4jClient.GraphClient.<>c__DisplayClass1b`1.<Neo4jClient.IRawGraphClient.ExecuteGetCypherResultsAsync>b__1a(Task`1 responseTask) in c:\TeamCity\buildAgent\work\f1c4cf3efbf1b05e\Neo4jClient\GraphClient.cs:line 745
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
---> (Inner Exception #0) System.AggregateException: One or more errors occurred. ---> System.Threading.Tasks.TaskCanceledException: A task was canceled.
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at Neo4jClient.GraphClient.<>c__DisplayClass3.<SendHttpRequestAsync>b__2(Task`1 requestTask) in c:\TeamCity\buildAgent\work\f1c4cf3efbf1b05e\Neo4jClient\GraphClient.cs:line 149
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
---> (Inner Exception #0) System.Threading.Tasks.TaskCanceledException: A task was canceled.<---
<---

This is being tracked as an issue at https://bitbucket.org/Readify/neo4jclient/issue/70/taskcancelledexception
Diagnosis and eventual 'official' resolution will be posted there.

It took me hours to identify this issue and fix it.
[edit]: Don't use Neo4jClient.GraphClient, use Neo4jClient.BoltGraphClient - both derive from IGraphClient - the BoltGraphClient doesn't use an HttpClient behind the scenes and is way faster and less memory intensive.
var BoltGraphClient = new Neo4jClient.BoltGraphClient(url,username,password);
my old answer + story:
I'm putting a ton of Cypher queries into a List<Task> and executing them via query.ExecuteWithoutResultsAsync(). The Neo4j server can only handle so much at a time and will put the request in a queue.
I've confirmed that the TaskCanceledException gets thrown after 100 seconds, which is the default timeout of HttpClient.
After reading the documentation, I've figured out how to specify an infinite timespan during the initialization of the graphclient. Hope this will save you time.
var httpClientWrapper = new Neo4jClient.HttpClientWrapper(
username,
password,
new System.Net.Http.HttpClient() {
Timeout = System.Threading.Timeout.InfiniteTimeSpan
});
var graphClient = new Neo4jClient.GraphClient(new Uri(url), httpClientWrapper);

Handle Unhandled Exception: System.Net.WebException: The request timed out?

I am using web references in my app but I am getting following exception.
I have used bellow code.
obj is my web reference object. It does not take obj directly that is why I have used variable for that. But still it's not working, it takes me automatically to previous activity.
var url=obj.ToString();
// Create a new WebRequest Object to the mentioned URL.
WebRequest myWebRequest=WebRequest.Create(url);
Console.WriteLine("\nThe Timeout time of the request before setting is : {0} milliseconds",myWebRequest.Timeout);
// Set the 'Timeout' property in Milliseconds.
myWebRequest.Timeout=10000;
// This request will throw a WebException if it reaches the timeout limit before it is able to fetch the resource.
WebResponse myWebResponse=myWebRequest.GetResponse();
Unhandled Exception: System.Net.WebException: The request timed out
at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult)
[0x00000] in :0 at
System.Net.HttpWebRequest.GetResponse () [0x00000] in :0 at
System.Web.Services.Protocols.WebClientProtocol.GetWebResponse
(System.Net.WebRequest request) [0x00000] in :0

It hit your timeout, meaning it did not get a response from the URL it called in time.
Check the URL in a browser. Check if it returns anything and how long it takes.
Make sure you don't need to configure a proxy.